The CLANG_VERSION for svn clang versions have a svn suffix "8.0.0svn" and all the libraries have a svn suffix.
But not the in builtin include dir. It still points to
"/usr/lib/clang/8.0.0/include/cpuid.h"
without the suffix.
Extend the PATH_SUFFIXES to also looks a version without svn suffix.
BUG: 399439